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Middle Holocene daily light cycle reconstructed from the strontium/calcium ratios of a fossil giant clam shell

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Title: Middle Holocene daily light cycle reconstructed from the strontium/calcium ratios of a fossil giant clam shell
Authors: Hori, Masako Browse this author
Sano, Yuji Browse this author →KAKEN DB
Ishida, Akizumi Browse this author
Takahata, Naoto Browse this author
Shirai, Kotaro Browse this author →KAKEN DB
Watanabe, Tsuyoshi Browse this author →KAKEN DB
Keywords: Biogeochemistry
Issue Date: 4-Mar-2015
Publisher: Nature Publishing Group
Journal Title: Scientific reports
Volume: 5
Start Page: 8734
Publisher DOI: 10.1038/srep08734
Abstract: Insolation is an important component of meteorological data because solar energy is the primary and direct driver of weather and climate. Previous analyses of cultivated giant clam shells revealed diurnal variation in the Sr/Ca ratio, which might reflect the influence of the daily light cycle. We applied proxy method to sample from prehistoric era, a fossil giant clam shell collected at Ishigaki Island in southern Japan. The specimen was alive during the middle Holocene and thus exposed to the warmest climate after the last glacial period. This bivalve species is known to form a growth line each day, as confirmed by the analysis of the Sr enrichment bands using EPMA and facilitated age-model. We analyzed the Sr/Ca, Mg/Ca and Ba/Ca ratios along the growth axis, measuring a 2-mmspot size at 2-mminterval using NanoSIMS. The Sr/Ca ratios in the winter layers are characterized by a striking diurnal cycle consisting of narrow growth lines with high Sr/Ca ratios and broad growth bands with low Sr/Ca ratios. These variations, which are consistent with those of the cultivated clam shell, indicate the potential for the reconstruction of the variation in solar insolation during the middle Holocene at a multi-hourly resolution.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邊 剛

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